from __future__ import annotations

from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker, create_async_engine

from backend.config.settings import DatabaseSettings


def create_engine(settings: DatabaseSettings) -> AsyncEngine:
    return create_async_engine(
        settings.url,
        pool_pre_ping=True,
        future=True,
    )


def create_session_factory(engine: AsyncEngine) -> async_sessionmaker[AsyncSession]:
    return async_sessionmaker(engine, expire_on_commit=False)